Airbag control unit with part number 89170-06B51

What does the airbag control unit 89170-06B51 do?

The airbag control unit 89170-06B51 controls the restraint system (SRS) in Lexus. It checks the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system during operation.

The monitoring runs on every journey. If the unit detects a deviation, it stores the fault and reports it to the airbag warning light.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-06B51 fail?

The most common cause is that crash data was stored after an accident, even if no airbag was triggered. A normal diagnostic tool does not remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The crash data remains in the control unit after the accident. Airbag24 erases it during the repair.

Heat, vibration and moisture act on the vehicle over years. Aged components, corrosion at plug connections and cold solder joints can cause faults as a result. Voltage spikes, by contrast, occur briefly.

How can you tell that the 89170-06B51 is defective?

The airbag warning light lights up permanently or intermittently in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light is a clear indication that the system has detected a fault. Anyone who sees it should have the fault memory read out promptly.

A connection error during read-out can have various causes. Only the fault memory provides a reliable assessment of this.

Which vehicles is the 89170-06B51 fitted in?

The control unit 89170-06B51 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The affected models and versions are listed here:

• Lexus ES AXZH60 (from 2018)

Compare the part number on the label of the unit with this page, then you know that it is the right unit. Have the fault memory read out beforehand. Only this shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-06B51 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Create a repair order online and send in the well-packed unit. The processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components. Afterwards Airbag24 erases the stored crash data and carries out a function test. After that you receive your own unit back.

Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 89170-06B51 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

Put the printed repair order into the parcel and pack the control unit shockproof.